The result of thee semisolid agar colony-forming assay. Anchorage-independent growth in soft agar was examined with control cells and cells that displayed downregulation of SMOX expression. The numbers of colonies were measured after 14 days. Colony formation in the siRNA-treated group was reduced compared to that in the control group (HCT116, 31%; HT29, 38%; SW480, 33%; and SW620, 21%). Colonies were visualized in violet color. (A) Comparison of the growth of colonies with control cells and siRNA-treated cells (Original magnification ×40). (B) The graph indicates the number of colonies and the percentage difference between the control cells and siRNA-treated cells (* p < 0.05, *** p < 0.001).